Tunable and Efficient Tin Modified Nitrogen‐Doped Carbon Nanofibers for Electrochemical Reduction of Aqueous Carbon Dioxide
Tunable and Efficient Tin Modified Nitrogen‐Doped Carbon Nanofibers for Electrochemical Reduction of Aqueous Carbon Dioxide
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DOI：
10.1002/aenm.201702524
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发表时间：
2018-04
影响因子：
27.8
通讯作者：
Yong Zhao;Jiaojiao Liang;Caiyun Wang;Jianmin Ma;G. Wallace
中科院分区：
文献类型：
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作者：
Yong Zhao;Jiaojiao Liang;Caiyun Wang;Jianmin Ma;G. Wallace
高效和选择性的地球丰富的催化剂是非常需要的，以推动二氧化碳电化学转化为增值化学品。在这项工作中，开发了一种低成本的Sn改性的N掺杂碳纳米管混合催化剂，用于通过直接的静电纺丝技术结合热解过程在水介质中进行可切换的CO2电还原。电催化性能可以通过N掺杂的碳纳米纤维上的Sn物种的结构来调节。Sn纳米颗粒驱动高效甲酸盐形成，具有11 mA cm−2的高电流密度和690 mV的中等过电位下62%的法拉第效率。原子分散的Sn物种促进CO2转化为CO，在490 mV的低过电位下具有91%的高法拉第效率。Sn物种和吡啶-N之间的相互作用可能在调节这两种材料的催化活性和选择性方面发挥重要作用。
Efficient and selective earth‐abundant catalysts are highly desirable to drive the electrochemical conversion of CO2 into value‐added chemicals. In this work, a low‐cost Sn modified N‐doped carbon nanofiber hybrid catalyst is developed for switchable CO2 electroreduction in aqueous medium via a straightforward electrospinning technique coupled with a pyrolysis process. The electrocatalytic performance can be tuned by the structure of Sn species on the N‐doped carbon nanofibers. Sn nanoparticles drive efficient formate formation with a high current density of 11 mA cm−2 and a faradaic efficiency of 62% at a moderate overpotential of 690 mV. Atomically dispersed Sn species promote conversion of CO2 to CO with a high faradaic efficiency of 91% at a low overpotential of 490 mV. The interaction between Sn species and pyridinic‐N may play an important role in tuning the catalytic activity and selectivity of these two materials.